Please answer c) and d). Thanks!

. Book Shop Bill Calculator: Assume that you are a working as a manager in a book shop. Currently the shop does all the billing manually. As you have learned business programming, you are required to write a simple VBA program to automate the billing process. The program should request book title, quantity and unit price. To promote the reading, the book shop is offering 20% discount if the total purchase amount is above RM200 and 10% discount if the total purchase amount is above RM100. You need to add 6% GST for the total purchase amount after the discount. As you have learned functions in VBA which helps you to divide the problem in to small tasks, you are required to create your function to calculate Total price after discount and Total price after GST charges. NOTE: Create your function to calculate Total price after discount and Total price after GST charges. Make sure you call the two functions created in main program. Write visual basic program, execute the program with sample inputs and show the outputs. (4 Marks) c) d) Attach the screen shots of the program, inputs and output. (1 Mark)